Researchers analyzed medical data from American astronauts to assess fracture risks following space missions. The study, published in Mayo Clinic Proceedings, utilized Bayesian probabilistic modeling due to the limited number of individuals who have traveled to space.
Data indicates that astronauts spending over 90 days in space face a higher risk of hip fractures upon returning to Earth. These injuries occurred at a younger age than typically observed in the general population, suggesting long-term impacts of bone density loss.
Microgravity is identified as the primary cause, as the lack of load on bones and muscles leads to structural changes. Astronauts may feel fully recovered after landing, despite their bones not having returned to pre-flight strength levels.
NASA currently monitors bone health using dual-energy X-ray absorptiometry and quantitative computed tomography before and after missions. These methods allow for detailed assessment of bone recovery and specific tissue changes.
The findings are critical for future space exploration, including missions exceeding six months, the Artemis lunar program, and potential crewed expeditions to Mars.
